security/selinux/include/objsec.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /*
   3  *  NSA Security-Enhanced Linux (SELinux) security module
   4  *
   5  *  This file contains the SELinux security data structures for kernel objects.
   6  *
   7  *  Author(s):  Stephen Smalley, <sds@tycho.nsa.gov>
   8  *              Chris Vance, <cvance@nai.com>
   9  *              Wayne Salamon, <wsalamon@nai.com>
  10  *              James Morris <jmorris@redhat.com>
  11  *
  12  *  Copyright (C) 2001,2002 Networks Associates Technology, Inc.
  13  *  Copyright (C) 2003 Red Hat, Inc., James Morris <jmorris@redhat.com>
  14  *  Copyright (C) 2016 Mellanox Technologies
  15  */
  16 #ifndef _SELINUX_OBJSEC_H_
  17 #define _SELINUX_OBJSEC_H_
  18
  19 #include <linux/list.h>
  20 #include <linux/sched.h>
  21 #include <linux/fs.h>
  22 #include <linux/binfmts.h>
  23 #include <linux/in.h>
  24 #include <linux/spinlock.h>
  25 #include <linux/lsm_hooks.h>
  26 #include <linux/msg.h>
  27 #include <net/net_namespace.h>
  28 #include "flask.h"
  29 #include "avc.h"
  30
  31 struct task_security_struct {
  32         u32 osid;               /* SID prior to last execve */
  33         u32 sid;                /* current SID */
  34         u32 exec_sid;           /* exec SID */
  35         u32 create_sid;         /* fscreate SID */
  36         u32 keycreate_sid;      /* keycreate SID */
  37         u32 sockcreate_sid;     /* fscreate SID */
  38 } __randomize_layout;
  39
  40 enum label_initialized {
  41         LABEL_INVALID,          /* invalid or not initialized */
  42         LABEL_INITIALIZED,      /* initialized */
  43         LABEL_PENDING
  44 };
  45
  46 struct inode_security_struct {
  47         struct inode *inode;    /* back pointer to inode object */
  48         struct list_head list;  /* list of inode_security_struct */
  49         u32 task_sid;           /* SID of creating task */
  50         u32 sid;                /* SID of this object */
  51         u16 sclass;             /* security class of this object */
  52         unsigned char initialized;      /* initialization flag */
  53         spinlock_t lock;
  54 };
  55
  56 struct file_security_struct {
  57         u32 sid;                /* SID of open file description */
  58         u32 fown_sid;           /* SID of file owner (for SIGIO) */
  59         u32 isid;               /* SID of inode at the time of file open */
  60         u32 pseqno;             /* Policy seqno at the time of file open */
  61 };
  62
  63 struct superblock_security_struct {
  64         u32 sid;                        /* SID of file system superblock */
  65         u32 def_sid;                    /* default SID for labeling */
  66         u32 mntpoint_sid;               /* SECURITY_FS_USE_MNTPOINT context for files */
  67         unsigned short behavior;        /* labeling behavior */
  68         unsigned short flags;           /* which mount options were specified */
  69         struct mutex lock;
  70         struct list_head isec_head;
  71         spinlock_t isec_lock;
  72 };
  73
  74 struct msg_security_struct {
  75         u32 sid;        /* SID of message */
  76 };
  77
  78 struct ipc_security_struct {
  79         u16 sclass;     /* security class of this object */
  80         u32 sid;        /* SID of IPC resource */
  81 };
  82
  83 struct netif_security_struct {
  84         struct net *ns;                 /* network namespace */
  85         int ifindex;                    /* device index */
  86         u32 sid;                        /* SID for this interface */
  87 };
  88
  89 struct netnode_security_struct {
  90         union {
  91                 __be32 ipv4;            /* IPv4 node address */
  92                 struct in6_addr ipv6;   /* IPv6 node address */
  93         } addr;
  94         u32 sid;                        /* SID for this node */
  95         u16 family;                     /* address family */
  96 };
  97
  98 struct netport_security_struct {
  99         u32 sid;                        /* SID for this node */
 100         u16 port;                       /* port number */
 101         u8 protocol;                    /* transport protocol */
 102 };
 103
 104 struct sk_security_struct {
 105 #ifdef CONFIG_NETLABEL
 106         enum {                          /* NetLabel state */
 107                 NLBL_UNSET = 0,
 108                 NLBL_REQUIRE,
 109                 NLBL_LABELED,
 110                 NLBL_REQSKB,
 111                 NLBL_CONNLABELED,
 112         } nlbl_state;
 113         struct netlbl_lsm_secattr *nlbl_secattr; /* NetLabel sec attributes */
 114 #endif
 115         u32 sid;                        /* SID of this object */
 116         u32 peer_sid;                   /* SID of peer */
 117         u16 sclass;                     /* sock security class */
 118         enum {                          /* SCTP association state */
 119                 SCTP_ASSOC_UNSET = 0,
 120                 SCTP_ASSOC_SET,
 121         } sctp_assoc_state;
 122 };
 123
 124 struct tun_security_struct {
 125         u32 sid;                        /* SID for the tun device sockets */
 126 };
 127
 128 struct key_security_struct {
 129         u32 sid;        /* SID of key */
 130 };
 131
 132 struct ib_security_struct {
 133         u32 sid;        /* SID of the queue pair or MAD agent */
 134 };
 135
 136 struct pkey_security_struct {
 137         u64     subnet_prefix; /* Port subnet prefix */
 138         u16     pkey;   /* PKey number */
 139         u32     sid;    /* SID of pkey */
 140 };
 141
 142 struct bpf_security_struct {
 143         u32 sid;  /* SID of bpf obj creator */
 144 };
 145
 146 struct perf_event_security_struct {
 147         u32 sid;  /* SID of perf_event obj creator */
 148 };
 149
 150 extern struct lsm_blob_sizes selinux_blob_sizes;
 151 static inline struct task_security_struct *selinux_cred(const struct cred *cred)
 152 {
 153         return cred->security + selinux_blob_sizes.lbs_cred;
 154 }
 155
 156 static inline struct file_security_struct *selinux_file(const struct file *file)
 157 {
 158         return file->f_security + selinux_blob_sizes.lbs_file;
 159 }
 160
 161 static inline struct inode_security_struct *selinux_inode(
 162                                                 const struct inode *inode)
 163 {
 164         if (unlikely(!inode->i_security))
 165                 return NULL;
 166         return inode->i_security + selinux_blob_sizes.lbs_inode;
 167 }
 168
 169 static inline struct msg_security_struct *selinux_msg_msg(
 170                                                 const struct msg_msg *msg_msg)
 171 {
 172         return msg_msg->security + selinux_blob_sizes.lbs_msg_msg;
 173 }
 174
 175 static inline struct ipc_security_struct *selinux_ipc(
 176                                                 const struct kern_ipc_perm *ipc)
 177 {
 178         return ipc->security + selinux_blob_sizes.lbs_ipc;
 179 }
 180
 181 /*
 182  * get the subjective security ID of the current task
 183  */
 184 static inline u32 current_sid(void)
 185 {
 186         const struct task_security_struct *tsec = selinux_cred(current_cred());
 187
 188         return tsec->sid;
 189 }
 190
 191 #endif /* _SELINUX_OBJSEC_H_ */